Method of making a rubber covered roll



y 1966 H. c. MORROW 3,248,775

METHOD OF MAKING A RUBBER COVERED ROLL Original Filed Oct. 10, 1963 BHARRY C. MORROW mflfiw fww Attorney nv VE/V TOR.

United States Patent O METHOD OF MAKING A RUBBER CQVERED ROLL Harry C.Morrow, Eethel Park, Pa., assignor to United State's Steel Corporation,a corporation of Delaware Original application Get. 10, 1963, Ser. No.315,278, new

Patent No. 3,196,791, dated July 27, 1965. Divided and this applicationFeb. 5, 1965, Ser. No. 430,689

2 Claims. (Cl. 29148.4)

This application, which is a division of my co-pending applicationSerial No. 315,278, filed October 10, 1963, now Patent No. 3,196,701granted July 27, 1965, relates to a method of making a rubber coveredroll, particularly a slotted centering roll such as shown in LorigPatent No. 2,592,581 dated April 15,1952. Rubber covered rolls are oftenused in belted conveying systems and in other locations where it may bevery diflicult and expensive to remove the rolls and ship them to arubber company for recovering. Also, it is expensive to stock sparerolls.

It is therefore an object of my invention to provide a method of makinga rubber covered roll in which the rubber covering can be readilyremoved and replaced without the necessity of shipping the roll to arubber company.

This and other objects will be more apparent after referring to thefollowing specification and attached drawings, in which:

FIGURE 1 is a cross sectional view of a roll made according to themethod of my invention;

FIGURE 2 is an enlarged view, partly in section, of a portion of theroll of FIGURE 1;

:FIGURE 3 is an elevation of the roll of FIGURE 1;

FIGURE 4 is a transverse fragmentary sectional view of the roll ofFIGURE 1 on an enlarged scale; and

FIGURE 5 is a transverse sectional view showing a step in themanufacture of the roll.

Referring more particularly to the drawings, reference numeral 4indicates a roll shell. A rubber covering 6 is provided over the shell 4and as shown has a uniform outer diameter. However, the center part ofthe roll may have a greater diameter than its ends. A plurality of slots8 and 10 are provided in the covering 6, the slots 8 being slanted inthe opposite direction from the slots '10. In each case the slots extendfrom the surface of the roll toward its axis away from the transversecenter of the roll in the same manner as the slots of the roll of theLorig patent mentioned above. The s1ots'8 and 10 are preferably widerthan the slots normally provided and the bottom of the slots areparallel to the axis of the roll. The rubber covering 6 has a lap joint12 therein extending at an angle transversely across the roll. Thearrangement of the joint 12 is preferably as shown in FIGURE 4 wherethe'arrow indicates the direction of rotation of the roll. Suitablebonding material, not shown, secures the rubber covering 6 to the rollshell 4 and also secures the ends of the rubber covering together at thejoint 12. A band 14 preferably made of steel extends around theperiphery of the roll within at least some of the slots 8 and 10. Theband 14 bears against the bottom of its associated slot and a ho1e'16 ispreferably provided at each end of the band in alignment with a hole 18through the rubber covering 4. A screw 19 extends through the holes 16and 18 and through a hole 20 in the steel shell 4 so as to provideadditional protection against the covering slipping on the shell. Otherfasteners such as bolts and studs may be used in place of the screw 19and the term screw as used in the 3,248,775 Patented May 3, 1966 claimsis intended to include such other fastening devices. If desired the endsof the band may be secured together with a strap binder of a usual typeand the screws omitted. v

-In carrying out the method of my invention I provide a mandrel 22having the same diameter as the shell 4 and a length at least as greatas the shell 4. A rubber covering 24 is placed around the mandrel 22 tothe desired thickness and the rubber vulcanized, after which the surfaceof the rubber is machined to the desired contour. The peripheral slots 8and 10 are then provided in the rubber to a depth less than thethickness of the rubber. The steps so far described are those used incovering a roll shell when it is shipped to the rubber manufacturer.adhesive which will permit ready removal of the finished rubber coveringafter it has been vulcanized and machined. A slit 26 is then cut intothe rubber across the full length thereof preferably at an angle ofabout 15. The rubber covering is then shipped to the customer whoremoves the old covering from its steel shell and places the newcovering around the shell 4. A bonding material such as rubber cement isapplied to the shell 4 and/or inner surface of the covering 6 and alsoto the ends of the covering formed by the slit 26. The steel bands 14are then applied and the roll is ready for operation.

While one embodiment of my invention has been shown and described itwill be apparent that other adaptations and modifications may be madewithout departing from the scope of the following claims.

I claim:

1. The method of making a rotatable roll having a preformed rubbercovering surrounding a metal shell, which method comprises providing amandrel having the same diameter as the metal shell and a length atleast as long as the metal shell, placing the rubber around the mandrelto the desired thickness, vulcanizing said rubber, machining the surfaceof said rubber, forming peripheral slots in said rubber to a depth lessthan the thickness of said rubber, then removing said rubber as a unitfrom said mandrel, placing said removed rubber around said shell, andfastening said rubber to said shell.

2. The method of making a rotatable roll having a preformed rubbercovering surrounding a metal shell, which method comprises providing amandrel having the same diameter as the metal shell and a length atleast as long as the metal shell, placing rubber around the mandrel tothe desired thickness, vulcanizing said rubber, machining the surface ofsaid rubber, forming peripheral slots in said rubber to a depth lessthan the thickness of said rubber, cutting a slit through said rubber atan angle transversely across the width thereof and removing said rubberas a unit from said mandrel, placing said removed rubber around saidshell, and bonding it thereto, placing bands in at least some of saidslots with the bands bearing against the bottom of the slots, andpassing a screw through each of said bands and said rubber into saidshell.

References Cited by the Examiner UNITED STATES PATENTS 2,450,727 10/1948Haushalter 29148.4

2,592,581 4/1952 Lorig 29- 123 X 3,081,495 3/196-3 Kovatch 29-1484 XWHITMORE A. WILTZ, Primary Examiner.

The mandrel 22 may be coated with an

1. THE METHOD OF MAKING A ROTATABLE ROLL HAVING A PREFORMED RUBBER COVERING SURROUNDING A METAL SHELL, WHICH METHOD COMPRISES PROVIDING A MANDREL HAVING THE SAME DIAMETER AS THE METAL SHELL AND A LENGTH AT LEAST AS LONG AS THE METAL SHELL, PLACING THE RUBBER AROUND THE MANDREL TO THE DESIRED THICKNESS, VULCANIZING SAID RUBBER, MACHING THE SURFACE OF SAID RUBBER, FORMING 